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The definition of expertise is advanced knowledge or skill. An example of expertise is a master gardener's knowledge of gardening. the skill, knowledge, judgment, etc. of an expert.
Proficiency is described as a mastery or skill with a tool. The following is a list of areas that need to be mastered in order to claim proficiency status. Know the Language. The first core element needed to be proficient in Microsoft Excel is knowledge of the language. Every industry or occupation contains its own jargon. Such a terminology is specific to that field and is usually unknown by members outside of that field.